Effect of pH and Buffer on Butyric Acid Production and Microbial Community Characteristics in Bioconversion of Rice Straw with Undefined Mixed Culture
文献类型： 外文期刊
作者： Ai, Binling 1 ; Li, Jianzheng 1 ; Chi, Xue 1 ; Meng, Jia 1 ; Jha, Ajay Kumar 1 ; Liu, Chong 1 ; Shi, En 1 ;
作者机构： 1.Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Heilongjiang, Peoples R China
2.Chinese Acad Trop Agr Sci CATAS, Haikou Expt Stn, Hainan 570102, Peoples R China
关键词： butyric acid production;rice straw;pH;pH buffer;undefined mixed culture
期刊名称：BIOTECHNOLOGY AND BIOPROCESS ENGINEERING （ 影响因子：2.836； 五年影响因子：2.281 ）
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收录情况： SCI
摘要： This study was conducted to identify the optimum pH range and the appropriate buffer for butyric acid production from rice straw by fermentation using an undefined mixed culture. A series of experiments conducted at pH levels of 5.0 ～ 7.0 showed that neutral pH improved rice straw conversion and consequently carboxylic acid production. The highest butyric acid production (up to 6.7 g/L) was achieved at pH of 6.0 ～ 6.5, while it was only 1.7 g/L without pH control or at pH 5.0. Another series of experiments conducted at pH 6.0 ～ 6.5 buffered with CaCO_3, NaHCO_3, NH_4HCO_3 and their combinations indicated that different buffers had different effects onthe product spectrum, and that CaCO_3 combined with NaHCO_3 was an effective buffer for butyric acid production. The highest total volatile fatty acids (about 12.6 g/L) production and one of the two highest butyric acid concentrations (about 7.6 g/L) were obtained by buffering with CaCO_3 combined with NaHCO_3. PCR-DGGE analysis revealed that different pH and buffers also influenced the microbial population distribution. Bacteria were suppressed at low pH , while the bacterial community structures at higher pH varied slightly. Overall, this study presents an alternative method for butyric acid production from lignocellulosic biomass without supplementary cellulolytic enzyme.
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